if you don't want to splice just go to the junkyard and get a plug then pop the blue pieces out on the obd plug and the wires slide out.

swap your wires over and then put the pieces back..

pretty easy i added a plug to the passenger side so i could leave my tuner hooked up and not have to deal with it being strung above my feet. also used one of the obd plugs from the car to make an offboard unit so i could flash pcm's out of the car if i needed to..pulled the blue pieces out and removed the wires i didn't need.